Data Tools
Deduplicate List
Remove duplicate lines from any list instantly. Preserve original order or sort results. Optional case-sensitive matching. Free and private.
Updates as you type 🔒Private · nothing uploaded
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About this tool
Deduplicate List
Clean up any list by removing duplicate entries instantly. Perfect for mailing lists, contact sheets, inventory lists, or any data where duplicates cause problems.
Features
- Preserve order — keeps the first occurrence of each item in its original position
- Sort results — optionally sorts the deduplicated output alphabetically
- Case sensitivity — choose whether ‘Apple’ and ‘apple’ are treated as the same item
- Instant results — processes thousands of lines in milliseconds
Common Use Cases
- Cleaning email marketing lists
- Removing duplicate contacts from exported data
- Preparing unique product SKUs
- Filtering unique entries from log files
Privacy
All processing happens in your browser. No list data is transmitted or stored.
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FAQ
Questions
Is my list uploaded to a server?+
No. All deduplication happens in your browser. Your data never leaves your computer.
Can I preserve the original order?+
Yes, the default setting preserves the first occurrence of each item in its original position.
Does case sensitivity matter?+
You can choose. By default, 'Apple' and 'apple' are treated as duplicates. Enable case-sensitive mode to treat them as different.
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